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-rw-r--r--libdimension/camera.c66
1 files changed, 66 insertions, 0 deletions
diff --git a/libdimension/camera.c b/libdimension/camera.c
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+++ b/libdimension/camera.c
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+/*************************************************************************
+ * Copyright (C) 2008 Tavian Barnes <tavianator@gmail.com> *
+ * *
+ * This file is part of The Dimension Library. *
+ * *
+ * The Dimension Library is free software; you can redistribute it and/ *
+ * or modify it under the terms of the GNU Lesser General Public License *
+ * as published by the Free Software Foundation; either version 3 of the *
+ * License, or (at your option) any later version. *
+ * *
+ * The Dimension Library is distributed in the hope that it will be *
+ * useful, but WITHOUT ANY WARRANTY; without even the implied warranty *
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
+ * Lesser General Public License for more details. *
+ * *
+ * You should have received a copy of the GNU Lesser General Public *
+ * License along with this program. If not, see *
+ * <http://www.gnu.org/licenses/>. *
+ *************************************************************************/
+
+#include "dimension.h"
+#include <stdlib.h> /* For malloc */
+
+dmnsn_camera *
+dmnsn_new_camera()
+{
+ return malloc(sizeof(dmnsn_camera));
+}
+
+void
+dmnsn_delete_camera(dmnsn_camera *camera)
+{
+ free(camera);
+}
+
+/* Perspective camera */
+
+static dmnsn_line dmnsn_perspective_camera_ray_fn(const dmnsn_canvas *canvas,
+ unsigned int x,
+ unsigned int y);
+
+dmnsn_camera *
+dmnsn_new_perspective_camera()
+{
+ dmnsn_camera *camera = dmnsn_new_camera();
+ camera->ray_fn = &dmnsn_perspective_camera_ray_fn;
+ return camera;
+}
+
+void
+dmnsn_delete_perspective_camera(dmnsn_camera *camera)
+{
+ dmnsn_delete_camera(camera);
+}
+
+static dmnsn_line
+dmnsn_perspective_camera_ray_fn(const dmnsn_canvas *canvas,
+ unsigned int x, unsigned int y)
+{
+ dmnsn_line l;
+ l.x0 = dmnsn_vector_construct(0.0, 0.0, 0.0);
+ l.n.x = ((double)x)/(canvas->x - 1) - 0.5;
+ l.n.y = ((double)y)/(canvas->y - 1) - 0.5;
+ l.n.z = 1.0;
+ return l;
+}